5f4e6a86d5
This PR updates the formatting of, and adds explanations for, "unknown identifier" errors as well as "failed to infer type" errors for binders and definitions. It attempts to ameliorate some of the confusion encountered in #1592 by modifying the wording of the "header is elaborated before body is processed" note and adding further discussion and examples of this behavior in the corresponding error explanation.
68 lines
1.2 KiB
Text
68 lines
1.2 KiB
Text
/-!
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# Testing the `value_of%` term elaborator
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-/
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/-!
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Basic case of success for local definitions.
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-/
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/--
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trace: x : Nat := 1 + 1
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hx : x = 1 + 1
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⊢ True
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-/
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#guard_msgs in
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example : True := by
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let x := 1 + 1
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have hx : x = value_of% x := rfl
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trace_state
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trivial
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/-!
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Basic case of success for global constants.
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Note that it evaluates to a lambda with an implicit parameter.
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-/
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/--
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trace: hx : @id = fun {α} a => a
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⊢ True
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-/
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#guard_msgs in
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example : True := by
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have hx : @id.{1} = value_of% id := rfl
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trace_state
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trivial
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/-!
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Referring to a global constant with no value.
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-/
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/--
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error: Constant has no value.
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---
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error: unsolved goals
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⊢ True
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-/
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#guard_msgs in
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example : True := by
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let a := value_of% True
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/-!
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Referring to a non-existent identifier, error.
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-/
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/--
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error: Unknown constant `_TESTS_LEAN_RUN_VALUETERM_not_used_in_Lean`
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---
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error: unsolved goals
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⊢ True
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-/
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#guard_msgs in
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example : True := by
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let a := value_of% _TESTS_LEAN_RUN_VALUETERM_not_used_in_Lean
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/-!
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Referring to a cdecl, error since no value.
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-/
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/-- error: Local declaration has no value. -/
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#guard_msgs in
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example : True := by
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have x := 1 + 1
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have hx : x = value_of% x := rfl
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